JPH0459905B2 - - Google Patents
Info
- Publication number
- JPH0459905B2 JPH0459905B2 JP63098173A JP9817388A JPH0459905B2 JP H0459905 B2 JPH0459905 B2 JP H0459905B2 JP 63098173 A JP63098173 A JP 63098173A JP 9817388 A JP9817388 A JP 9817388A JP H0459905 B2 JPH0459905 B2 JP H0459905B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- cooling member
- polyvinyl alcohol
- gel
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 97
- 229920005989 resin Polymers 0.000 claims description 46
- 239000011347 resin Substances 0.000 claims description 46
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 45
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 45
- 238000001816 cooling Methods 0.000 claims description 44
- 239000002250 absorbent Substances 0.000 claims description 19
- 230000002745 absorbent Effects 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000009834 vaporization Methods 0.000 claims description 8
- 230000008016 vaporization Effects 0.000 claims description 8
- 230000008014 freezing Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 239000005022 packaging material Substances 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 238000007127 saponification reaction Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- 238000010257 thawing Methods 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims 1
- 239000000499 gel Substances 0.000 description 46
- 239000000047 product Substances 0.000 description 19
- 239000002245 particle Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 5
- 230000003203 everyday effect Effects 0.000 description 4
- 229920000578 graft copolymer Polymers 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- PEXNXOXCZLFQAO-ODZAUARKSA-N (z)-but-2-enedioic acid;ethenyl acetate Chemical compound CC(=O)OC=C.OC(=O)\C=C/C(O)=O PEXNXOXCZLFQAO-ODZAUARKSA-N 0.000 description 3
- 238000001879 gelation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241000519695 Ilex integra Species 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 150000008064 anhydrides Chemical group 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 235000011869 dried fruits Nutrition 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000012567 medical material Substances 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Thermotherapy And Cooling Therapy Devices (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
［産業上の利用分野］
本発明は、水分の蒸発潜熱利用の冷却部材に関
する。特に、水分の蒸発潜熱を直接利用した室温
より数度位低い程度の低い接触温度で冷気を感じ
る安眠可能な枕様部材或いは枕上に置く枕カバー
部材に適する冷却部材に関する。
［従来の技術］
従来就寝時に頭を冷やす方法として各種ゲル状
物を冷蔵又は冷凍して枕代わりにする方式がある
が、あまりに冷え過ぎることがあるために、病気
で発熱時に使用する等の特殊な条件下でしか用い
られていない。
即ち、従来のものは、ゲル状固体を水蒸気難透
過性のプラスチツクフイルムで密閉し、内部ゲル
の伝熱のみを利用しているため始めは極端に冷た
く、かつ伝熱が悪く、次第に冷却効果が低下して
くる傾向がある。また、従来の冷却材は、０℃以
上のものでは、保冷効果が少なく、融解熱を利用
するためには０℃以下にしなければならない。
また、従来公知のゲル体としてポリアクリルア
ミド、ポリビニールアルコールの低温処理ゲル化
物があるが、これらは一度放湿すると水に浸漬し
ても殆ど吸水せず、数日かけても復元が困難であ
る。
一方、高吸水性樹脂は自重の数百倍の水分を吸
収するが、強度が弱くなり、また、蒸発すれば容
積が収縮し、単独では一定の形状を保持すること
はできないものである。
［発明が解決しようとする問題点］
上記のような状況において、本発明者らは、従
来の冷却部材と異なり、温和な状態で冷却できる
簡易冷却部材を提供する。即ち、本発明は、乾湿
球温度計の原理と同じく、直接蒸発潜熱を利用し
て、室温より数度から十度位低い接触温度により
冷気を感じ、安眠が可能とする枕或いは枕の上に
置くマクラカバーとして使用できる潜熱利用冷却
部材を提供することを目的とする。また、本発明
は、高い放湿速度、例えば、一夜の使用により約
100ｇ〜200ｇの水分を蒸発せしめ、且つ、毎日又
は隔日おきに水に浸漬して再生せしめるだけで十
分に冷却部材として使用できるものを提供するこ
とを目的とする。また、本発明は、水分を蒸発し
ても殆ど形状を変化しなく、一定の強度と弾性を
有し、繰り返しの使用に耐える冷却部材を提供す
ることを目的とする。
［問題点を解決するための手段］
本発明は、ポリビニールアルコールと高吸水性
樹脂を、30〜90重量％：70〜10重量％の割合で混
合した混合物１重量部に対し、水４〜30重量部を
含有した組成のゲルを冷却凍結し、解凍した深冷
ゲル化体を有し、含有水分の蒸発潜熱を利用する
含水冷却部材である。そのゲル化体は、含水率80
％以上であり、高い吸水速度と高い放湿速度を有
するものが好適である。そして、ポリビニールア
ルコールは、88％以上の鹸化度と、1000以上の重
合度を有し、高吸水性樹脂は粉末状であるものが
好適である。用いるゲル化体は、上記のポリビニ
ールアルコールと高吸水樹脂とを含水させたまま
混合し、強く撹拌後に−10℃以下に冷却凍結した
後、解凍して得られるものである。また、そのゲ
ル化体は、防黴処理を施したものがよい。また、
そのゲル化体は、水蒸気透過性包材に入れられて
用いられ得る。また、紫外線遮断剤を該包材又は
ゲル化材内に包含せしめたものが好適である。
本発明によると、吸水と放湿のリサイクル可能
な含水弾性体即ち、ゲル体で枕の代わり又は枕の
上に置いて、その蒸発潜熱を利用し室温より数度
〜十度位低い温度を得ることができる潜熱冷却部
材が得られる。このような冷却部材は、特に、夏
場に、快適な睡眠を得るために便利な含水枕を提
供し得るものである。
本発明により利用するゲル体、即ち、含水弾性
体は、枕に必要な強度、弾性力、腰の強さ、吸水
と放湿を繰り返しても、一定の形状を長期に保持
することのできるものである。
又、このようなゲル体は、容易に防黴処理を施
すことができ、取り扱い易いものである。
そして、本発明によると、上記のような特質を
満足するものとして、ポリビニールアルコールと
高吸水性樹脂より主として形成され、含水率80％
以上を含み、適当な吸水と放湿の速度を有するも
のを用いると好適である。
更に、本発明によると、ポリビニールアルコー
ル50〜80重量％と高吸水性樹脂50〜20重量％より
なる混合物１重量部に対して、水10重量部〜25重
量部の組成のものを深冷ゲル化せしめて得たゲル
体が、より好適である。
更に、本発明によると、ポリビニールアルコー
ルは、88％以上の高鹸化度と1000以上の高重合度
を持つものが望ましく、高吸水樹脂は、40メツシ
ユ〜150メツシユの粒子のものが好適である。
得られるゲル化体に適度な腰と強度を与えるた
めに、上記の範囲の鹸化度と重合度のポリビニー
ルアルコールを用いるものである。
本発明により利用するゲル体は、ポリビニール
アルコールをその水溶液として適当な濃度とし、
高吸水樹脂は、そのまま或いは水分を含有せしめ
たものを混合し、強く撹拌した後、約零下10度以
下に冷却し、凍結したものを、温度を戻し、解凍
して得たものである。
［作用］
本発明によるゲル化体は、成分のポリビニール
アルコールと高吸水性樹脂の混合割合は、ポリビ
ニールアルコールの比率が高くなると、ゲル化体
の［腰］がなくなり、ポリビニールアルコールの
比率が低下すると、脆さが出てくるものである。
即ち、ポリビニールアルコールのゲルは、高吸水
性樹脂の粉体を保持する支持体の作用を有し、ポ
リビニールアルコールゲルが多くなると、吸水性
が低下し、引張り強度はあるが、腰がなくなつて
くる。
また、ポリビニールアルコール水溶液と高吸水
性樹脂の含水物とを混合すると、夫々の水の含有
率は、異なつても、水分の総量が等しければ、作
業の難易度は別にして、双方を混合した後に、撹
拌時間を長くすると、最終的にはほとんど同じも
のになり、ゲルを凍結した後も、途中の水分含有
の配分は、ゲル化体の性能に影響を与えない。
本発明の水分含有冷却部材では、上記で説明し
たゲル化体が、吸水と放湿を速度早く繰り返すも
のであるから、従来の冷却部材と異なり、水蒸気
易透性の特殊フイルム又は不織布、綿布などゲル
化体を包み、その水蒸気の発散を容易にする必要
がある。また、ゲル化体は、一夜の使用により、
約100〜200ｇの水分を蒸発するために、毎日或い
は隔日おきに水分を吸わせて、再生する必要があ
る。
本発明に利用できるゲル化体の条件として、水
分を蒸発してもほとんど形状を変化することのな
いこと、一定の強度と弾性を有し、繰り返い使用
に耐えるものでなければ、ならない。
従来の公知のゲル体としてのポリビニールアル
コール又はポリアクリルアミドの低温処理ゲル化
体があるが、これらは、一度放湿すると水に浸漬
してもほとんど吸水せずに、数日かけても、復元
は、困難である。これに対して、高吸水性樹脂は
自重の数百倍の水分を吸収するが、ゲル化体の強
度が弱くなり、また、蒸発すると容積が収縮し、
単独では、一定の形状を保持できなくなる。
然し乍ら、本発明による含水冷却部材では、こ
の２つの成分（双方）を組合わせ、適当な配合比
率範囲内では、２つの成分の欠点を補完し合い、
利点のみが、発現される条件を見出しことができ
た。
即ち、高吸水性樹脂は、ゲルに固化する前に吸
水させ、その粒子の大きさが決まる。次に、ポリ
ビニールアルコール水溶液と混合し、撹拌し、ポ
リビニールアルコール水溶液の中に、高吸水性樹
脂粒子が散布された形状になり、冷却凍結し、ゲ
ル化を促進せしめるときには、骨格はポリビニー
ルアルコールで連続形成され、高吸水性樹脂は球
状又は不定形の形で、連続又は単独的に分布する
こととなり、海と島の関係の形状で、ポリビニー
ルアルコールゲルの中に高吸水性樹脂の島が存在
する形状になる。
従つて、本発明により利用するゲル化体は、海
のポリビニールアルコールゲルが多くなり、90重
量％以上になると、腰がなくなり、脆さがでる。
そして、高吸水性樹脂粒子は、ポリビニールアル
コールに引き付けられ、ある程度硬くゲルが組織
され、強度が保たれ、弾力が得られるものであ
る。70重量％まで含有するには、不都合が生じな
い。以上のような種々の考察の上に、ポリビニー
ルアルコールと高吸水性樹脂を、30〜90重量％：
70〜10重量％の割合のものを用いた。
水分は、これらのポリビニールアルコールゲル
及び高吸水性樹脂の双方に含有され、配分される
が、その配分比は、撹拌に伴い、適当な配分が確
保されるものである。
例えば、極端な場合、高い濃度の（例えば、15
〜20％）のポリビニールアルコール水溶液に数十
倍に含水した高吸水性樹脂を混合した場合、或い
は、数％と低い濃度のポリビニールアルコール水
溶液中に粉末として高吸水性樹脂を投入した場
合、十分に撹拌し、時間をかけると、ほとんど同
じゲル化体が得られる。作業の上、実際上では、
ママコ等の発生などの問題が生じる場合もある。
含水ゲル化体の含水率は、80％以上のものが、
形成体にしたときに、放湿による体積減少が少な
く、放湿速度が早くでき、強い弾力性を有してお
り、特に好適である。また、壁面保冷材に好適に
応用できるものである。また、約95％前後の含水
率でも、板状、ブロツク状、棒或いは各種形状に
成形でき、保冷材として広く応用できる。
以上の問題は、高吸水性樹脂の種類、形状等に
より、左右され、一概に言えないが、実際には水
分を２つの成分に適当な配分することが望ましい
ものである。
更に、腰のある弾力性を得るようにするために
は、粘土としては、つき立て餅の程度のものに、
撹拌で微小泡を混入せしめ、ゲル化体の比重を、
0.7〜0.9の範囲になるように調整することによ
り、透水性、透湿性を改良することができる。
更に、ポリビニールアルコールに対する高吸水
性樹脂としては、ポリアクリル酸塩を始めとし、
一般に市販されているポリエチレンオキシド、ポ
リビニールピロリドン、スルフオン化ポリエチレ
ン、澱粉−（メタ）アクリロニトリル共重合体鹸
化物、澱粉−アクリル酸共重合体、ポリアクリル
アミド、ビニールエステル−不飽和カルボン酸
（又はその誘導体）共重合鹸化物、即ち、アクリ
ル酸、メタクリル酸、クロトン酸などの不飽和モ
ノカルボン酸又はそのエステル、塩、マイレン
酸、フマール酸、イタコン酸などの不飽和ジカル
ボン酸又はその部分又は完全エステル、塩、無水
物等で変性されたポリビニールアルコールが典型
的なものとして上げられる。然し乍ら、本発明に
用いられる高吸水性樹脂はこれらに限定されるも
のでなく、本発明の目的に合致し、それを達成で
きるものであれば、どのような高吸水性樹脂も使
用できる。かかる高吸水樹脂に10倍から10倍程度
含水せしめて、ポリビニールアルコール水溶液を
固化に必要な最少量加えて混練し、型枠に詰めて
冷却凍結することによつても本発明のゲル化体を
製造できる。
本発明の含水冷却部材は、蒸発潜熱を利用し
て、冷却するマクラ材ばかりでなく、保冷材料と
して、例えば、野菜等の保冷の必要のある物品の
保冷材としても利用できるものである。また、医
療材料としても、潜熱利用の保冷効果を利用でき
る。
更に、紫外線遮断材を、包材又はゲル化体の中
に含有せしめて、紫外線の影響を防ぐことができ
る。その紫外線遮断材としては、例えば、超微粒
子TiO2を用いることができる。即ち、TiO2微粒
子は、包材中のポリエチレンフイルム中分散させ
て、紫外線遮断効果を得ることができる。即ち紫
外線遮断により、本発明の樹脂等による含水冷却
部材の耐候性を向上することができる。
次に、実施例により、本発明の含水冷却部材を
説明するが、本発明は、これによつて限定される
ものではない。
実施例 １
鹸化度98％、重合度1700のポリビニルアルコー
ル30ｇを、水170ｇに分散し、かけまぜながら加
温し、90℃で完全に溶解した後に、冷却する。
更に、架橋ポリアクリル酸ソーダ15ｇを水500
ｇに投入した後に、撹拌し、粉末化せしめ、これ
に防黴剤0.7ｇとEDTA−2Na0.5ｇを加えた後
に、前記のようにして得た15％ポリビニールアル
コール溶液を撹拌しながら徐々に加える。混合終
了後に急に粘度が上昇し、餅状になるまでに至る
が、これを、縦180mm、横250mm、深さ20mmのバツ
トに泡混入状態のままで入れ、成形し、冷凍庫内
に一昼夜放置する。
冷凍庫より取り出し解凍すると、ゲル体を得る
が、その比重は、0.85で、腰のある白色を帯びた
ゴム状の弾性体であり、次に示すような性状を有
する。
(1) 放湿性能：30℃で40％の相対湿度下での放湿
量は、次の通りである。上記のように製造した
700ｇのゲル体を、30℃で40％の相対湿度の雰
囲気中に放置すると、８時間後では、100ｇの
水分が放湿され、600ｇになり、次に、15℃60
％の相対湿度の室温雰囲気に14時間放置する
と、580ｇになり、次に、30℃40％の相対湿度
の雰囲気中に22時間置くと500ｇになつた。
（尚、枕としてこの冷却部材を使用すると一夜
（８時間）で更に50ｇが体温で蒸発する）
(2) 吸水性能：上気のようにして放湿した本発明
によるゲル体500ｇを15℃の水中に浸漬すると、
次の表に示すように、変化する。
[Industrial Field of Application] The present invention relates to a cooling member that utilizes the latent heat of vaporization of water. In particular, the present invention relates to a cooling member suitable for use as a pillow-like member or a pillow cover member placed on a pillow that allows a person to sleep soundly and feel cool air at a low contact temperature of several degrees lower than room temperature, which directly utilizes the latent heat of vaporization of water. [Prior technology] Conventionally, there are methods to cool the head while sleeping by refrigerating or freezing various gel-like materials and using them as a pillow. It is only used under certain conditions. In other words, in the conventional method, the gel-like solid is sealed with a plastic film that is difficult to permeate to water vapor, and only the heat transfer of the internal gel is used, so it is extremely cold at first, and the heat transfer is poor, and the cooling effect gradually decreases. There is a tendency to decline. Moreover, conventional coolants have little cold retention effect when they are above 0°C, and in order to utilize the heat of fusion, the temperature must be below 0°C. In addition, conventionally known gel bodies include low-temperature-treated gels of polyacrylamide and polyvinyl alcohol, but once these are dehumidified, they hardly absorb water even when immersed in water, and are difficult to restore even after several days. . On the other hand, superabsorbent resin absorbs several hundred times its own weight in water, but its strength becomes weaker and its volume contracts when it evaporates, making it unable to maintain a fixed shape by itself. [Problems to be Solved by the Invention] In the above-mentioned situation, the present inventors provide a simple cooling member that can perform cooling in a mild state, unlike conventional cooling members. That is, the present invention utilizes the direct latent heat of vaporization, similar to the principle of a wet-and-dry bulb thermometer, to sense cold air at a contact temperature that is several to ten degrees lower than room temperature, allowing for a pillow or pillow to sleep soundly. The purpose of the present invention is to provide a cooling member using latent heat that can be used as a pillow cover. The present invention also provides high moisture release rates, e.g.
The purpose of the present invention is to provide a cooling member that can evaporate 100g to 200g of water and can be used as a cooling member simply by being immersed in water every day or every other day for regeneration. Another object of the present invention is to provide a cooling member that hardly changes its shape even when water is evaporated, has a certain level of strength and elasticity, and can withstand repeated use. [Means for Solving the Problems] The present invention provides 1 part by weight of a mixture of polyvinyl alcohol and super absorbent resin in a ratio of 30 to 90% by weight: 70 to 10% by weight, and 4 to 4 parts by weight of water. This is a water-containing cooling member that has a deep-chilled gelled product obtained by cooling and freezing a gel containing 30 parts by weight and thawing it, and utilizes the latent heat of vaporization of the water contained therein. The gelled product has a water content of 80
% or more and has a high water absorption rate and a high moisture release rate. Preferably, the polyvinyl alcohol has a degree of saponification of 88% or more and a degree of polymerization of 1000 or more, and the superabsorbent resin is in powder form. The gelled product used is obtained by mixing the above-mentioned polyvinyl alcohol and super absorbent resin while still containing water, stirring vigorously, cooling and freezing the mixture to below -10°C, and then thawing the mixture. Further, the gelled product is preferably treated with anti-mildew treatment. Also,
The gelled product can be used in a water vapor permeable packaging material. Further, it is preferable that a UV blocking agent is included in the packaging material or gelling material. According to the present invention, a recyclable water-containing elastic material that absorbs and releases moisture, that is, a gel material, is placed in place of or on top of a pillow, and its latent heat of vaporization is used to obtain a temperature several to ten degrees lower than room temperature. A latent heat cooling member is obtained. Such a cooling member can provide a water-containing pillow that is convenient for obtaining a comfortable sleep, especially in the summer. The gel body used in the present invention, that is, the hydrous elastic body, has the strength, elasticity, and waist strength required for a pillow, and can maintain a constant shape for a long period of time even after repeated water absorption and moisture release. It is. Moreover, such a gel body can be easily subjected to anti-mildew treatment and is easy to handle. According to the present invention, as a product that satisfies the above characteristics, it is made mainly from polyvinyl alcohol and super absorbent resin, and has a water content of 80%.
It is preferable to use a material that includes the above properties and has appropriate water absorption and moisture release rates. Furthermore, according to the present invention, a mixture containing 10 to 25 parts by weight of water to 1 part by weight of a mixture consisting of 50 to 80% by weight of polyvinyl alcohol and 50 to 20% by weight of superabsorbent resin is deep cooled. A gel body obtained by gelation is more suitable. Further, according to the present invention, polyvinyl alcohol preferably has a high saponification degree of 88% or more and a high polymerization degree of 1000 or more, and the superabsorbent resin preferably has particles of 40 mesh to 150 mesh. . Polyvinyl alcohol having a degree of saponification and a degree of polymerization within the above ranges is used in order to impart appropriate stiffness and strength to the resulting gelled product. The gel body used in the present invention is prepared by preparing polyvinyl alcohol as an aqueous solution at an appropriate concentration,
Super water-absorbing resins are obtained either as they are or by mixing them with moisture, stirring them vigorously, cooling them to about -10 degrees Celsius or less, freezing them, returning the temperature to thawing them. [Function] In the gelled body according to the present invention, the mixing ratio of polyvinyl alcohol and superabsorbent resin as components is such that as the ratio of polyvinyl alcohol increases, the gelled body loses its stiffness, and the ratio of polyvinyl alcohol increases. When this decreases, fragility appears.
In other words, the polyvinyl alcohol gel acts as a support that holds the superabsorbent resin powder, and as the amount of polyvinyl alcohol gel increases, the water absorbency decreases, and although it has tensile strength, it lacks stiffness. I'm getting old. Furthermore, when an aqueous polyvinyl alcohol solution and a water-containing superabsorbent resin are mixed, even if the respective water contents are different, as long as the total amount of water is the same, it is possible to mix both, regardless of the difficulty of the work. After that, if the stirring time is increased, the result will be almost the same, and even after the gel is frozen, the distribution of water content during the process will not affect the performance of the gelled product. In the water-containing cooling member of the present invention, since the gelled body described above rapidly repeats water absorption and moisture release, unlike conventional cooling members, it is possible to use a special film, nonwoven fabric, cotton cloth, etc. that is easily permeable to water vapor. It is necessary to wrap the gelled body so that its water vapor can escape easily. In addition, the gelled product can be used overnight,
In order to evaporate about 100 to 200 g of water, it is necessary to absorb water and regenerate it every day or every other day. The gelled body that can be used in the present invention must hardly change its shape even after evaporating water, have a certain level of strength and elasticity, and be able to withstand repeated use. Conventionally known gel bodies include low-temperature treated gel bodies of polyvinyl alcohol or polyacrylamide, but once these are immersed in water, they absorb almost no water and do not recover even after several days. It is difficult. On the other hand, superabsorbent resin absorbs several hundred times its own weight in water, but the strength of the gel becomes weaker and its volume contracts when it evaporates.
If used alone, it will not be possible to maintain a certain shape. However, in the water-containing cooling member according to the present invention, these two components (both) are combined, and within an appropriate mixing ratio range, the drawbacks of the two components are complemented,
Only benefits could be found under conditions to be expressed. That is, the superabsorbent resin absorbs water before solidifying into a gel, and the size of its particles is determined. Next, it is mixed with a polyvinyl alcohol aqueous solution and stirred to form a shape in which superabsorbent resin particles are dispersed in the polyvinyl alcohol aqueous solution, and when it is cooled and frozen to promote gelation, the skeleton is made of polyvinyl alcohol. The superabsorbent resin is continuously formed with alcohol, and the superabsorbent resin is distributed continuously or singly in a spherical or irregular shape. The shape is such that an island exists. Therefore, the gelled product used in the present invention has a large amount of sea polyvinyl alcohol gel, and when it exceeds 90% by weight, it loses its elasticity and becomes brittle.
The superabsorbent resin particles are attracted to polyvinyl alcohol, form a somewhat hard gel, maintain strength, and provide elasticity. No inconvenience occurs when the content is up to 70% by weight. Based on the above various considerations, polyvinyl alcohol and super absorbent resin were mixed at 30 to 90% by weight:
A proportion of 70 to 10% by weight was used. Moisture is contained in both the polyvinyl alcohol gel and the superabsorbent resin and is distributed, and the distribution ratio is such that an appropriate distribution is ensured with stirring. For example, in extreme cases, high concentrations (e.g. 15
When a super absorbent resin containing tens of times more water is mixed into an aqueous solution of polyvinyl alcohol (~20%), or when a super absorbent resin is added as a powder into an aqueous polyvinyl alcohol solution with a concentration as low as a few percent, By stirring thoroughly and taking time, almost the same gelled product can be obtained. In work and in practice,
Problems such as the occurrence of mamako etc. may occur. The water content of the hydrogelated product is 80% or more,
When formed into a molded product, it is particularly suitable because it has little volume loss due to moisture release, can quickly release moisture, and has strong elasticity. Moreover, it can be suitably applied to a wall cold insulating material. Furthermore, even with a moisture content of around 95%, it can be formed into plates, blocks, rods, and various other shapes, making it widely applicable as a cold insulation material. The above problems depend on the type, shape, etc. of the superabsorbent resin, and cannot be generalized, but in reality, it is desirable to appropriately distribute water between the two components. Furthermore, in order to obtain firm elasticity, the clay should be the same as freshly pounded mochi,
Microbubbles are mixed in by stirring, and the specific gravity of the gelled product is
By adjusting it within the range of 0.7 to 0.9, water permeability and moisture permeability can be improved. Furthermore, as super absorbent resins for polyvinyl alcohol, including polyacrylates,
Generally commercially available polyethylene oxide, polyvinyl pyrrolidone, sulfonated polyethylene, saponified starch-(meth)acrylonitrile copolymer, starch-acrylic acid copolymer, polyacrylamide, vinyl ester-unsaturated carboxylic acid (or its derivative) ) copolymerized saponified products, i.e., unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid or their esters and salts; unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid, or partial or complete esters thereof; Typical examples include polyvinyl alcohol modified with salts, anhydrides, etc. However, the super absorbent resin used in the present invention is not limited to these, and any super absorbent resin can be used as long as it meets the purpose of the present invention and can achieve it. The gelled product of the present invention can also be produced by impregnating the superabsorbent resin with water by about 10 to 10 times, adding a minimum amount of polyvinyl alcohol aqueous solution necessary for solidification, kneading, filling in a mold, and cooling and freezing. can be manufactured. The water-containing cooling member of the present invention can be used not only as a pillow material to be cooled using latent heat of vaporization, but also as a cold insulation material for items that need to be kept cold, such as vegetables. In addition, it can also be used as a medical material due to its cold-insulating effect using latent heat. Furthermore, an ultraviolet blocking material can be included in the packaging material or gel to prevent the effects of ultraviolet rays. As the ultraviolet blocking material, for example, ultrafine TiO 2 particles can be used. That is, TiO 2 fine particles can be dispersed in a polyethylene film in a packaging material to obtain an ultraviolet blocking effect. That is, by blocking ultraviolet rays, the weather resistance of the water-containing cooling member made of the resin or the like of the present invention can be improved. Next, the water-containing cooling member of the present invention will be explained with reference to Examples, but the present invention is not limited thereto. Example 1 30 g of polyvinyl alcohol with a degree of saponification of 98% and a degree of polymerization of 1700 is dispersed in 170 g of water, heated while stirring, completely dissolved at 90° C., and then cooled. Furthermore, add 15 g of cross-linked sodium polyacrylate to 500 g of water.
After adding the 15% polyvinyl alcohol solution obtained above, it was stirred and powdered, and after adding 0.7 g of anti-mold agent and 0.5 g of EDTA-2Na, the 15% polyvinyl alcohol solution obtained as above was gradually mixed with stirring. Add. After mixing, the viscosity suddenly increases and it becomes cake-like, but the mixture is placed in a vat measuring 180 mm long, 250 mm wide, and 20 mm deep, with bubbles mixed in, and then molded and left in the freezer overnight. do. When taken out from the freezer and thawed, a gel body is obtained, which has a specific gravity of 0.85 and is a firm whiteish rubber-like elastic body with the following properties. (1) Moisture release performance: The amount of moisture released at 30℃ and 40% relative humidity is as follows. manufactured as above
When 700g of gel body is left in an atmosphere of 40% relative humidity at 30℃, after 8 hours, 100g of moisture is released and becomes 600g.
% relative humidity for 14 hours, it weighed 580 g, and then when it was left in an atmosphere of 30° C. and 40% relative humidity for 22 hours, it weighed 500 g. (If you use this cooling member as a pillow, an additional 50g will evaporate overnight (8 hours) due to your body temperature.) (2) Water absorption performance: 500g of the gel body of the present invention, which releases moisture like upper air, is heated to 15°C. When immersed in water,
Changes as shown in the table below.
【表】
(3) 放湿時の温度状況：
30℃40％相対湿度の雰囲気で１時間で10〜15
ｇ水分を放湿する場合には、外気温度30℃に対
しゲル体表面の温度は22℃で、ゲル体内部温度
は20℃でと約10℃程低い値を示した。
ゲル体そのものに直接接触すると、ひんやり
と感じられる。また、ゲル体にタオルを二重巻
きにして同様にして測定した結果、タオルとゲ
ル体表面温度は21℃で、タオル表面温度は22℃
で湿度90％であつた。
実施例 ２〜17
ポリビニールアルコールと高吸水性樹脂（架橋
ポリアクリル酸ソーダ）の組成変化による引張強
度、腰の強さ等のフアクターに対する影響、即
ち、実用化の場合の限界を調査した結果を示す。[Table] (3) Temperature conditions during dehumidification: 10 to 15 in 1 hour in an atmosphere of 30℃ and 40% relative humidity
When releasing moisture, the surface temperature of the gel body was 22°C and the internal temperature of the gel body was 20°C, which was about 10°C lower than the outside temperature of 30°C. When you come into direct contact with the gel itself, you will feel cool. In addition, as a result of the same measurement with a towel wrapped around the gel body, the surface temperature of the towel and gel body was 21℃, and the towel surface temperature was 22℃.
The humidity was 90%. Examples 2 to 17 The results of investigating the effects of compositional changes of polyvinyl alcohol and superabsorbent resin (crosslinked sodium polyacrylate) on factors such as tensile strength and stiffness, that is, the limits of practical application. show.
【表】
弾力性は、感触で観測した結果を示し、弾力性
の良好なものを○で、中程度のものを△で、不良
なものを×で示した。
引張強度は、B5版の大きさで厚さ10mmのゲル
板を両手で持つて軽く引つ張つた場合に、ちぎれ
るものを×、変形するものを△、復元するものを
○とした。
腰は、ゲル板の腰の強さを示し、50mm×50mm×
10mmのゲル板を片方端を固定し、他方端が垂れ下
がる距離を測定し、それが10mm以内を○、10〜20
mmを△、20mm以上を×とした。
この結果、ポリビニールアルコール量を少なく
すると高吸水性樹脂相互の接着性が不良となり、
脆く、ちぎれ易くなり、ポリビニールアルコール
比率が30％以下は望ましくない。また、吸水性樹
脂の比率が10％以下にすると、腰が殆どなくな
り、且つ放湿後の吸湿機能がなくなるものである
ことが明らかにされた。
実施例 18〜20
高吸水性樹脂として、架橋ポリアクリル酸ソー
ダ、酢酸ビニル−マレイン酸共重合体鹸化物、澱
粉−アクリル酸グラフト重合体の各々を使用し、
次のように、ゲル化を行ない、ゲル体を製造し
た。
即ち、高吸水性樹脂30％と重合度1800で鹸化度
98％のポリビニールアルコール70％の比率で実施
例１と同様な手順でゲル体を製造し、その弾力
性、固さ、引張強度、腰の強さを上気の実施例２
〜17で測定したと同様な方法で測定し、その結果
を次の表に示す。[Table] Elasticity is the result of observation by touch, and good elasticity is indicated by ○, moderate elasticity is indicated by △, and poor elasticity is indicated by ×. For tensile strength, when a gel plate with a thickness of 10 mm and the size of a B5 plate is held with both hands and pulled lightly, those that tear are marked as ×, those that are deformed are marked as △, and those that recover are marked as ○. The waist indicates the strength of the gel board's waist, 50mm x 50mm x
Fix a 10mm gel plate at one end, measure the distance the other end hangs down, and if it is within 10mm, mark it as ○, 10 to 20.
mm is △, and 20 mm or more is ×. As a result, when the amount of polyvinyl alcohol is reduced, the adhesion between the superabsorbent resins becomes poor.
It is undesirable for the polyvinyl alcohol ratio to be less than 30%, as it becomes brittle and easily torn. Furthermore, it has been revealed that when the proportion of water-absorbing resin is 10% or less, there is almost no stiffness and the moisture-absorbing function after moisture release is lost. Examples 18-20 As the super absorbent resin, each of crosslinked sodium polyacrylate, saponified vinyl acetate-maleic acid copolymer, and starch-acrylic acid graft polymer was used,
Gelation was performed to produce a gel body as follows. In other words, the saponification degree is 30% super absorbent resin and the polymerization degree is 1800.
A gel body was produced using the same procedure as in Example 1 using a ratio of 98% polyvinyl alcohol to 70%, and its elasticity, hardness, tensile strength, and stiffness were evaluated using Example 2.
Measurements were made in the same manner as in ~17, and the results are shown in the following table.
【表】
フト重合体
第２表の評価の符号は、第１表と同じである。
使用した高吸水性樹脂の種類により、多少性状
に差が生じるが、これは吸水能力の違いによるも
ので、本来の吸水生樹脂が水を数百倍吸収する能
力を有するものであるから、本発明に利用してい
る30倍以内の範囲内では大きな影響は生じない。
実施例 21〜24
高吸水生樹脂の種類とその粒度の吸水速度に対
する影響を、調査した。即ち、本発明による冷却
部材を使用するときの、再生するための吸水の速
度の違いを調査した結果は次のようなものであつ
た。
実施例21は、100メツシユ以下の粒度の架橋ポ
リアクリル酸ソーダを高吸水性樹脂として用い
て、実施例１と同様にゲル体を製造した。但し、
その使用した高吸収性樹脂の粒度を所定のものを
用いた。700ｇのゲル体を使用し、放湿し、500ｇ
になつたものを、室温の水中に入れ、12時間放置
し、吸水せしめると、270ｇの水を吸水し、770ｇ
のゲル体が得られた。
実施例22は、100メツシユ以下の粒度の酢酸ビ
ニル−マレイン酸のグラフト共重合体を用いて、
実施例１と同様に製造したゲル体700ｇを放湿し、
480ｇとなつたものを、実施例21と同様に12時間
吸水せしめると、220ｇの水を吸水し、700ｇのゲ
ル体が得られた。
同様に、実施例23として、42〜100メツシユの
粒度の酢酸ビニル−マレイン酸のグラフト共重合
体を用いて、実施例１と同様に製造した700ｇの
ゲル体は、放湿し、500ｇになり、同様に吸水せ
しめると、12時間で140ｇの水を吸水し、640ｇと
なつた。
更に、実施例24として、７〜42メツシユの粒度
の酢酸ビニル−マレイン酸のグラフト共重合体を
用いて製造したゲル体700ｇは、放湿し、520ｇと
なり、12時間同様に吸水せしめると、80ｇの水を
吸水し、600ｇのゲル体が得られた。
実施例 25〜27
高吸水性樹脂とポリビニールアルコールの混合
割合による吸水速度と吸水量への影響を調べた。
即ち、ポリビニールアルコールの凍結処理により
得られたゲル化体は、全く吸水性能がなく、それ
に対して、高吸水性樹脂は単体では数百倍の吸水
性能がある。本発明によれば、この双方を混合す
ることにより所定の吸水量を確保できる製品が得
られるものである。
ここでは、双方の混合割合と吸水量、吸水速度
の関係を調べた。
実施例25は、架橋ポリアクリル酸ソーダを高吸
水性樹脂として0.1部用い、残りの0.9部として鹸
化度97％で重合度1700のポリビニールアルコール
を用いて、水20部を有するゲルを−20℃で24時間
処理して得たものを、水に浸漬して、その吸水速
度と吸水量を測定したものである。
同様に、実施例26は、高吸水性樹脂0.5部、ポ
リビニールアルコール0.5部に水20部を加えたも
のである。実施例27は、高吸水性樹脂0.7部にポ
リビニールアルコール0.3部としたものであるが、
これは水を吸収するに従い、殆ど強度が実質的に
なくなり、引つ張るとちぎれるようになる。
一般には、水を多量に吸収するとゲル化体強度
が弱くなることが見られるが、ポリビニールアル
コールの割合量が少なくなつて保持単体の役目を
十分に為し得なくなるためと思われる。[Table] Futhopolymers The evaluation codes in Table 2 are the same as in Table 1. There are some differences in properties depending on the type of super absorbent resin used, but this is due to the difference in water absorbing ability, and since the original water absorbing resin has the ability to absorb water several hundred times, There is no significant effect within the range of 30 times or less used in the invention. Examples 21 to 24 The influence of the type of highly water-absorbent raw resin and its particle size on the water absorption rate was investigated. That is, the results of investigating the difference in water absorption speed for regeneration when using the cooling member according to the present invention were as follows. In Example 21, a gel body was produced in the same manner as in Example 1 using cross-linked sodium polyacrylate having a particle size of 100 mesh or less as a super absorbent resin. however,
The superabsorbent resin used had a predetermined particle size. Uses 700g gel body, releases moisture, 500g
If you put the dried fruit in water at room temperature and leave it for 12 hours to absorb water, it will absorb 270g of water and weigh 770g.
A gel body was obtained. Example 22 uses a vinyl acetate-maleic acid graft copolymer with a particle size of 100 mesh or less,
700 g of the gel body produced in the same manner as in Example 1 was dehumidified,
When 480 g of the gel was allowed to absorb water for 12 hours in the same manner as in Example 21, 220 g of water was absorbed and 700 g of gel was obtained. Similarly, as Example 23, a 700 g gel body produced in the same manner as in Example 1 using a vinyl acetate-maleic acid graft copolymer with a particle size of 42 to 100 meshes was dehumidified and weighed 500 g. When water was similarly absorbed, it absorbed 140g of water in 12 hours, resulting in a total weight of 640g. Further, as Example 24, 700 g of a gel body produced using a vinyl acetate-maleic acid graft copolymer having a particle size of 7 to 42 meshes weighed 520 g after dehumidifying, and when it was allowed to absorb water for 12 hours, it weighed 80 g. of water was absorbed, and 600 g of gel was obtained. Examples 25 to 27 The influence of the mixing ratio of super absorbent resin and polyvinyl alcohol on the water absorption rate and amount was investigated.
That is, a gelled product obtained by freezing polyvinyl alcohol has no water absorption ability at all, whereas a super absorbent resin alone has several hundred times the water absorption ability. According to the present invention, a product that can ensure a predetermined amount of water absorption can be obtained by mixing both of them. Here, we investigated the relationship between the mixing ratio of both, water absorption amount, and water absorption rate. Example 25 uses 0.1 part of cross-linked sodium polyacrylate as a superabsorbent resin, and the remaining 0.9 part is polyvinyl alcohol with a degree of saponification of 97% and a degree of polymerization of 1700, and a gel containing 20 parts of water is The samples obtained by treatment at ℃ for 24 hours were immersed in water, and the water absorption rate and amount were measured. Similarly, in Example 26, 20 parts of water was added to 0.5 parts of super absorbent resin and 0.5 parts of polyvinyl alcohol. In Example 27, 0.7 parts of super absorbent resin and 0.3 parts of polyvinyl alcohol were added.
As it absorbs water, it virtually loses its strength and becomes susceptible to tearing when stretched. In general, it is observed that the strength of the gel becomes weaker when a large amount of water is absorbed, but this is probably because the proportion of polyvinyl alcohol decreases and cannot sufficiently function as a holding substance.
【表】
［発明の効果］
本発明の冷却部材は、ポリビニールアルコール
水溶液と高吸水性樹脂とを適当な配合にして混合
撹拌し、深冷して得たゲル化体を利用する構成に
より次のごとき技術的効果があつた。即ち、
(1) 乾湿球温度計の原理と同じく、直接蒸発潜熱
を利用して、接触温度により冷気を感じ、安眠
ができるマクラ材に利用できる冷却部材を提供
する。
(2) 水分の蒸発による潜熱利用して冷却する例え
ば、含水マクラを提供できるもので、それによ
り、室温より数度〜十度位低い温度を得ること
により、温和な冷却を得、特に、夏場などの快
適な睡眠を得ることのできる冷却マクラ材に利
用する冷却部材を提供する。
(3) 容易に防黴処理を施すことができる冷却部材
であり、衛生的に安全なマクラ材を提供する。
(4) マクラ材として適当な強度、弾力性、腰の強
さがあり、且つ、吸水速度及び放湿速度が高
く、使用するに都合よく、一夜の使用で約100
〜200ｇの水分を蒸散し、それに水分補給する
ために、毎日或いは隔日の水への浸漬で再生で
きる実用の冷却性を備えた冷却部材を提供す
る。
(5) 利用する潜熱利用ゲル化体は、適当な形状に
成形でき、各種の形状に成形し、保冷材、壁面
保冷材として利用でき、放湿が早く、また、吸
湿も早いため、毎日或いは隔日の水への浸漬で
再生できる冷却部材を提供する。
(6) 利用するゲル化体は、水分を蒸発してもほと
んど形状を変化せしめることがなく、一定の強
度を保持し、一定の弾力性を保持できるもので
あり、繰り返し使用に耐える冷却部材を提供す
る。
(7) 紫外線遮断材を包材或いはゲル化体に包含せ
しめることにより、利用するゲル化体の耐候性
を向上せしめた冷却部材を提供する。[Table] [Effects of the Invention] The cooling member of the present invention has a structure in which a polyvinyl alcohol aqueous solution and a superabsorbent resin are mixed and stirred in an appropriate composition, and a gelled product obtained by deep cooling is used. The technical effects were as follows. (1) Similar to the principle of a wet and dry bulb thermometer, we provide a cooling member that can be used in pillowcases, which uses direct latent heat of vaporization, allows you to feel cold air depending on the contact temperature, and allows you to sleep soundly. (2) For example, it is possible to provide a water-containing pillow that uses the latent heat of water evaporation to cool the body, thereby achieving a temperature several to ten degrees lower than room temperature, which provides mild cooling, especially in the summer. To provide a cooling member used for a cooling pillow material that allows a comfortable sleep. (3) To provide a hygienically safe pillow material that is a cooling member that can be easily treated with anti-mildew treatment. (4) It has suitable strength, elasticity, and stiffness as a pillow material, and has high water absorption and moisture release rates, making it convenient to use.
To provide a cooling member having practical cooling properties that can be regenerated by immersion in water every day or every other day in order to evaporate ~200 g of water and replenish it. (5) The latent heat-utilizing gel material used can be molded into an appropriate shape, can be molded into various shapes, and used as a cold insulation material or wall insulation material, and because it releases moisture quickly and absorbs moisture quickly, it can be used every day or To provide a cooling member that can be regenerated by immersion in water every other day. (6) The gel material to be used does not change its shape even when water evaporates, maintains a certain strength, and maintains a certain elasticity, making it possible to create a cooling member that can withstand repeated use. provide. (7) To provide a cooling member in which the weather resistance of the gelled material used is improved by incorporating an ultraviolet blocking material into the packaging material or the gelled material.
Claims (1)
30〜90重量％：70〜10重量％の割合で混合した混
合物１重量部に対して、水４〜30重量部を含有し
た組成のゲルを冷却凍結し、解凍した深冷ゲル化
体を有し、含有水分の蒸発潜熱を利用する含水冷
却部材。 ２ 前記ゲル化体は、含水率80％以上であり、適
度な吸水速度と適度な放湿速度を有することを特
徴とする特許請求の範囲第１項記載の含水冷却部
材。 ３ 前記ポリビニールアルコールは、88％以上の
鹸化度と、1000以上の重合度を有し、前記高吸水
性樹脂は、粉末或いは粒状であることを特徴とす
る特許請求の範囲第１項記載の含水冷却部材。 ４ 前記ゲル化体は、ポリビニールアルコール水
溶液と含水した高吸水性樹脂とを混合し、強く撹
拌した後に、−10℃以下に冷却凍結した後、解凍
して得たものであることを特徴とする特許請求の
範囲第１〜３項のいずれかに記載の含水冷却部
材。 ５ 前記ゲル化体は、水蒸気透過性包材に入れら
れている特許請求の範囲第１〜４項いずれかに記
載の含水冷却部材。 ６ 紫外線遮断材を、前記包材又は前記ゲル化体
内に包含せしめたことを特徴とする特許請求の範
囲第５項記載の含水冷却部材。 ７ 前記ゲル化体は、防黴処理を施したものであ
ることを特徴とする特許請求の範囲第１〜３項の
いずれかに記載の含水冷却部材。[Claims] 1. Polyvinyl alcohol and super absorbent resin,
A gel containing 4 to 30 parts by weight of water is cooled and frozen to 1 part by weight of the mixture at a ratio of 30 to 90% by weight: 70 to 10% by weight. A water-containing cooling member that utilizes the latent heat of vaporization of the water it contains. 2. The water-containing cooling member according to claim 1, wherein the gelled body has a water content of 80% or more, and has an appropriate water absorption rate and an appropriate moisture release rate. 3. The polyvinyl alcohol has a saponification degree of 88% or more and a polymerization degree of 1000 or more, and the superabsorbent resin is in the form of powder or granules. Water-containing cooling member. 4. The gelled product is obtained by mixing an aqueous polyvinyl alcohol solution and a water-containing superabsorbent resin, stirring the mixture strongly, freezing the mixture at -10°C or lower, and then thawing the mixture. A water-containing cooling member according to any one of claims 1 to 3. 5. The water-containing cooling member according to any one of claims 1 to 4, wherein the gelled body is placed in a water vapor permeable packaging material. 6. The water-containing cooling member according to claim 5, characterized in that an ultraviolet blocking material is included in the packaging material or the gelled body. 7. The water-containing cooling member according to any one of claims 1 to 3, wherein the gelled body is treated with anti-mildew treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63098173A JPH01270867A (en) | 1988-04-22 | 1988-04-22 | Hydrous cooling member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63098173A JPH01270867A (en) | 1988-04-22 | 1988-04-22 | Hydrous cooling member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01270867A JPH01270867A (en) | 1989-10-30 |
| JPH0459905B2 true JPH0459905B2 (en) | 1992-09-24 |
Family
ID=14212654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63098173A Granted JPH01270867A (en) | 1988-04-22 | 1988-04-22 | Hydrous cooling member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01270867A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05132661A (en) * | 1991-11-12 | 1993-05-28 | Kyoei Sangyo Kk | Composition for supplying water to animal tissue or plant |
| GB9320747D0 (en) * | 1993-10-08 | 1993-12-01 | Scholl Plc | A compress for use in the cold and/or hot treatment of an injury |
| US5990205A (en) * | 1997-08-18 | 1999-11-23 | Mattel, Inc. | Polyvinyl-based kneading and molding play composition |
| WO2000052112A1 (en) * | 1999-03-15 | 2000-09-08 | Toyo Eizai Kabushiki Kaisha | Cold-storage material with excellent shape stability and process for producing the same |
| WO2009032921A1 (en) | 2007-09-05 | 2009-03-12 | The General Hospital Corporation | Creep resistant, highly lubricious, tough, and ionic hydrogels including pva-paamps hydrogels |
| AU2017214566A1 (en) | 2016-02-05 | 2018-08-23 | The General Hospital Corporation | Drug eluting polymer composed of biodegradable polymers applied to surface of medical device |
| CN107903407A (en) * | 2017-11-21 | 2018-04-13 | 深圳大学 | A kind of preparation method of polyurethane hydrogel |
-
1988
- 1988-04-22 JP JP63098173A patent/JPH01270867A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01270867A (en) | 1989-10-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7812082B2 (en) | Thermoplastic coated superabsorbent polymer compositions | |
| RU2126023C1 (en) | Polymeric composition and process and preparing said composition | |
| US4333461A (en) | Borated polysaccharide absorbents and absorbent products | |
| US4624868A (en) | Borated polysaccharide absorbents and absorbent products | |
| ES2256794T3 (en) | SUPERABSORBENT POLYMERS AND METHOD FOR THEIR PRODUCTION. | |
| JPH0625543A (en) | Polymer composition for absorbing liquid containing protein | |
| BRPI0616389A2 (en) | heating cells comprising exothermic compositions with gel-forming absorbent material | |
| PT97231A (en) | Process for the treatment of an ABSORBENT RESIN, WHICH HAS A CARBOXYLIQUE GROUP, BY RETICULATION WITH A POLIFUNCTIONAL ALCOHOL | |
| EP0837077B1 (en) | Antibacterial water absorbing composition and method of manufacture | |
| JP4758960B2 (en) | Absorbent resin particles and absorbent articles | |
| JPS627745A (en) | Water-absorptive resin composition its production and water-absorptive and retentive agent | |
| JPH0459905B2 (en) | ||
| JP2012012451A (en) | Absorptive resin particle and absorptive article | |
| JP4323417B2 (en) | Humidity control material and humidity control method | |
| JPH0810616A (en) | Water absorbing composition and production thereof | |
| JPH1071330A (en) | Dry composition comprising an aromatic substance | |
| JPH0414156B2 (en) | ||
| JPH0645662B2 (en) | Method for producing absorbent polymer material | |
| WO2000052112A1 (en) | Cold-storage material with excellent shape stability and process for producing the same | |
| JPS5811581A (en) | Heat element composition | |
| US11827756B2 (en) | Free-flowing mixture, its use, and method for its production | |
| JPH0481492A (en) | Cold reserving material and production thereof | |
| JPH01311187A (en) | Cooling material | |
| JPH03296592A (en) | Cold insulator | |
| JP2548362B2 (en) | Coolant and its manufacturing method |